PURPOSE: To manufacture the titled fine acicular metal powder or stable quality at a low cost, by electrolyzing Al or an Al alloy having the surface coated with an anodically oxidized film in an aqueous phase containing one or more of metal ions to precipitate said metal ion in fine pores inside the coating film, and then removing said anodically oxidized film by dissolution.
CONSTITUTION: Al or an Al alloy having the surface coated with an anodically oxidized film is electrolyzed as an anode in an aqueous solution of one or more of water-soluble metal compounds as an electrolyte. After the electrolysis, said metal is precipitated in the fine pores of the anodically oxidized film on the surface. Thereafter, the surface is treated with an aqueous phosphoric acid solution having the excellent ability to dissolve an anodically oxidized film, e.g. one of concentration of 1W10% and a liquid temp. above 50°C, to dissolve said anodically oxidized film. Thus, the acicular powder of said metal is obtained.
NIITSUMA AKIRA
FUKUDA SHINJI
FUJIMOTO TAKESHI
Next Patent: METHOD FOR INHIBITING SCATTERING OF DUST CONTAINING GRAPHITE, ETC.